Enhancement of tensile properties applying phase separation with Cu addition in gas tungsten arc welds of CoCrFeMnNi high entropy alloys. (November 2022)

• Record Type: Journal Article
• Authors: Nam, Hyunbin; Park, Sanghyeon; Kim, Seong-Woong; Shim, Sang Hun; Na, Youngsang; Kim, Namkyu; Song, Sangwoo; Hong, Sun Ig; Kang, Namhyun
• Is Part Of: Scripta materialia. Number 220(2022)
• Publication Date: 2022-11
• Subjects: High-entropy alloys -- Phase separation -- GTA weldability -- Cu-rich phase -- Slip band; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2022.114897
• Languages: English
• ISSNs: 1359-6462

Abstract

Highlights: CuCrFeMnNi-based welds showed Cu-rich phase separation with FCC structures. Cu-rich phases enhanced the tensile properties of CuCrFeMnNi-based weld. The dislocation movement and slip bands in WM were hampered by forming Cu-rich phases. Cu-rich phases produced by Cu addition improved the weldability of HEA. Abstract: This study investigates the gas tungsten arc weldability of the high-entropy alloy CoCrFeMnNi using CoCrFeMnNi and CuCrFeMnNi fillers. The CoCrFeMnNi-based weld had the same face-centered cubic (FCC) structure as the base metal, and the CuCrFeMnNi-based weld exhibited phase separation of the Cu-rich phase in addition to the FCC structure. Although the grain size of the CuCrFMnNi-based weld was similar to that of the CoCrFeMnNi-based weld, the Cu-rich phase formed in the CuCrFMnNi-based weld enhanced its tensile properties. This occurred because the dislocation movement and slip band in the weld metal were hindered by the formation of the Cu-rich phase. Graphical abstract: Image, graphical abstract